CN100438363C - Bandwidth updating method and control flow for synchronous digital system - Google Patents
Bandwidth updating method and control flow for synchronous digital system Download PDFInfo
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- CN100438363C CN100438363C CNB2004100790849A CN200410079084A CN100438363C CN 100438363 C CN100438363 C CN 100438363C CN B2004100790849 A CNB2004100790849 A CN B2004100790849A CN 200410079084 A CN200410079084 A CN 200410079084A CN 100438363 C CN100438363 C CN 100438363C
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Abstract
The present invention relates to a bandwidth upgrading method for a synchronous digital system of digital information transmission and a control flow path thereof, which uses a multiplex section in a synchronous digital system network to protect a circuit single plate in an online upgrading net element. For a loop network, the circuit single plate for protecting is changed and reversed in time when the net element generates the phenomenon that the multiplex section is reversed and protected. For a linear network, after the circuit single plate used for protecting a channel is changed in time, the circuit single plate of a working channel is changed when the multiplex section is reversed and protected. For the linear network, the circuit single plate of the working channel is changed when the multiplex section is reversed and protected, the working channel is recovered, and the circuit single plate used for protecting the channel is changed. After the circuit single plate is changed, the information for the speed rate upgrade of the circuit single plate informs an APS to reverse a protocol. The present invention has the advantages of simple speed rate upgrading operation and less service loss.
Description
Technical field
The present invention relates to the transmission of digital information, relate in particular to a kind of bandwidth upgrading method.
Background technology
Fast development along with IP operation, to SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) the network demand of carrying out bandwidth upgrading is also more and more, upgrade to the SDH network of STM-64 as the SDH network rebuilding to original STM-16, and telecom operators are less because of traffic carrying capacity at the networking initial stage, in order to reduce investment outlay, wish to adopt earlier the wiring board of low rate such as STM-4, by the time traffic carrying capacity is replaced with other wiring board of higher rate level etc. again when increasing, all requirement can be carried out bandwidth upgrading easily, and upgrading is the smaller the better to the influence of original business.
Present most of SDH equipment is not supported the online upgrading of bandwidth, as the ring of a STM-16 being upgraded to fully the ring of STM-64, the ring that does not keep STM-16 after the upgrading, can only set up the ring of a STM-64 earlier in addition, then with the cut on original STM-16 to the STM-64 ring, remove the ring of original STM-16 again.
This upgrade method has two obvious defects:
1, the ring of creating new STM-64 can not use original STM-16 to encircle employed groove position, if not having idle groove position resource can use, then can't finish upgrading, and STM-16 encircles employed groove position and finally will discharge, but can not think that the STM-64 ring after the upgrading uses.
2, this upgrading mode need reconfigure the business of STM-16 ring on new STM-64 ring, if original business is more, complicated, the workload that business is reshuffled is bigger, and is when cut over, also bigger to the damage of business in addition.
In a word, existing upgrade method operation complexity and traffic lost are big.
Summary of the invention
The object of the present invention is to provide a kind of easy and simple to handle and bandwidth upgrading method and control flow that traffic lost is little, to overcome the defective of prior art.
Bandwidth upgrading method of the present invention is: in SDH (Synchronous Digital Hierarchy) SDH or Synchronous Optical Network SONET, utilize multiplex section protection, the circuit veneer in the online upgrading network element;
For ring network, when the multiplex section rearrangement protection took place between the network element, instantaneously changing was switched the related circuit veneer of protection;
Described multiplex section rearrangement produces by Forced Switch.
After described circuit veneer is replaced, the information notification APS APS turning protocol of circuit veneer speed upgrade;
After described circuit veneer was replaced, corresponding network element is the described speed upgrade of identification automatically, this information was notified the APS APS turning protocol module of this network element;
After described circuit veneer is replaced, issue the order of speed upgrade by webmaster, corresponding network element receives that this order back upgrades the data of inside, this information is notified the APS APS turning protocol module of this network element.
A kind of bandwidth upgrading method according to said method is characterized in that: it adopts following steps:
A1, in ring network, trigger the multiplex section rearrangement protection of a part of path;
A2, the described related circuit veneer of protection of switching of replacing are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
The multiplex section rearrangement of part of path described in A3, the cancellation step A1, the passage of resuming work;
Step: A4 be can also comprise after the described steps A 3, above-mentioned steps A1-A3, speed upgrade behind all circuit single-board replacements of other part of path repeated.
In the described steps A 1, the described part of path that is triggered the multiplex section rearrangement protection is presented as one or more adjacent network element sections;
Another kind of bandwidth upgrading method according to said method, it is characterized in that: it adopts following steps:
B1, in linear networking, change protection port line veneer;
B2, the protection of triggering multiplex section rearrangement;
B3, replacing service aisle circuit veneer are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
B4, cancellation multiplex section rearrangement, the passage of resuming work.
Another kind of bandwidth upgrading method according to said method, it is characterized in that: it adopts following steps:
C1, in linear networking, trigger the multiplex section rearrangement protection;
C2, replacing service aisle circuit veneer are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
C3, cancellation multiplex section rearrangement, the passage of resuming work;
C4, replacing protection port line veneer.
Beneficial effect of the present invention is, in the present invention, utilize the multiplex section protection in the SDH (Synchronous Digital Hierarchy) networking, circuit veneer in the online upgrading network element, this method is in the process of speed upgrade, do not need to reconfigure original business, obviously, according to the characteristic of multiplex section rearrangement protection as can be known, the damage to business in the process of upgrading is little, professional break period is less than 50ms, make the imperceptible professional once-interrupted mistake of user, can be described as a kind of seamless upgrade, and, the present invention is on the groove position at former low rate veneer place, directly the single-board replacement that original speed is lower becomes the higher veneer of speed, does not need to use other groove position, and is easy and simple to handle, therefore, speed upgrade of the present invention is easy and simple to handle and traffic lost is little; The present invention produces multiplex section rearrangement by Forced Switch, help to improve functional reliability, because the priority height of Forced Switch, and, it to switch speed fast, service outage duration is short, with respect to auto switching as pulling out veneer, pull out optical fiber etc., the switching time of auto switching will add the time of detection failure on the software, so during auto switching, time of service interruption is longer relatively, and after the auto switching, if fault has disappeared, software also can automatically recover, when fault disappears repeatedly and occurs, can cause switching and recovering shaking back and forth, when Forced Switch, have only by the cancellation Forced Switch and just can recover, so adopt the Forced Switch better reliability.
Description of drawings
Fig. 1 is that the protection of two fibre two-way multi-sections is switched at the forward and backward contrast schematic diagram of fault;
Fig. 2 is the schematic diagram that two fine two-way other SDH rings of STM-16 level upgrade to other SDH ring of STM-64 level;
Fig. 3 is a 1+1 multiplex section protection schematic diagram in the linear networking;
Fig. 4 is the basic procedure schematic diagram of ring network upgrading;
Fig. 5 is the basic procedure schematic diagram of linear networking upgrading;
Fig. 6 is another basic procedure schematic diagram of linear networking upgrading.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
In the SDH of reality networking, commonly used is ring network and linear networking, and complicated network is generally also made up by these two kinds of networking forms and changes realization, and the present invention just at ring network and linear networking, is described in detail respectively.
In ring network,, generally all dispose MSP-ring in order to improve the reliability of network.MSP-ring is meant by the K byte in the multiplex section in the expense finishes the series of protocols handshake procedure; carry out APS (Automatic Protection Switching; APS) switches; make originally to transfer on the protection passage (generally being the opposite direction that ring is gone up the fault route) and transmit, thereby make original business proceed to transmit and be unlikely to interrupt at the service signal that transmits on the impaired optical fiber.
As shown in Figure 1, four nodes of A-B-C-D are formed a SDH ring, and are before fault, professional in the break-through of B node, about A node and the C node.When these four node configuration are become MSP-ring; if the route between A and B breaks down (modal is disconnected fine); by the APS agreement, business goes up auto switching on the reciprocal protection passage to ring, and switching time is that time of service interruption can be less than 50ms.
The present invention utilizes the multiplex section protection in this SDH (Synchronous Digital Hierarchy) networking; circuit veneer in the online upgrading network element; when the multiplex section rearrangement protection took place between the network element, instantaneously changing was switched the related circuit veneer of protection, is replaced until all circuit veneers.
Upgrading to other SDH ring of STM-64 level with other SDH ring of one two fine two-way STM-16 level below is example, shown in the SDH ring before the upgrading of Fig. 2 top, four network element 1#, 2#, 3#, 4# constitutes other SDH ring of a STM-16 level, the both direction of each network element is other circuit veneer of STM-16 level, for convenience of explanation, with the unified rule of circuit veneer of the both direction of each network element turn to the west to east orientation circuit veneer, now need other circuit veneer of all STM-16 levels is replaced to other circuit veneer of STM-64 level, thereby other SDH ring of STM-16 level is escalated into other SDH ring of STM-64 level, in the process of upgrading, professional break period is less than 50ms.The concrete control flow of circuit single board updating is as follows:
Step 1: as shown in Figure 2, create one two fibre two-way multi-section ring protection, if other SDH ring of this STM-16 level has been configured MSP-ring, then this step can be omitted.
Step 2: check the loopful state, guarantee that MSP-ring is in Idle state, loop is normal, checks whether for some reason barrier generation MSP-ring is switched, if fault is arranged on the loop, should fix a breakdown.
Step 3: as Fig. 2 and shown in Figure 4; trigger the multiplex section rearrangement protection of a part of path; for example; allow and between network element 1# and the network element 2# multiplex section protection exchanging takes place; make through the business between 1# network element and the 2# network element and switch to other direction on the ring, with reference to figure 1, for this other upgrading of adjacent network element section speed level is prepared; here, the be triggered part of path of multiplex section rearrangement protection is presented as an adjacent network element section.
The method that the triggering multiplex section is switched has several, as auto switching, Manual Switch, Forced Switch etc.
Pull out the circuit veneer, the auto switching when switching of pulling out that optical fiber triggers belongs to fault and take place, when fault is got rid of, also can switch recovery automatically; And Manual Switch and Forced Switch are to switch command triggers by the outside that the user issues.The priority of the priority ratio auto switching of Manual Switch is low, can only be used for can being replaced by auto switching when loop breaks down under the normal situation of loop.The priority height of the priority ratio auto switching of Forced Switch under the Forced Switch state, even there is the fault that triggers auto switching to take place on the loop, also can not carry out auto switching, and it is constant to keep the Forced Switch state.
To the east of network element # 1 to or the west of network element # 2 to issuing the Forced Switch order; make loopful be in the Forced Switch state; the east of network element 1# is to switching with the business of west on service aisle of network element 2#; the protection passage of network element 3# and network element 4# carries out professional break-through; during Forced Switch, service outage duration is less than 50ms.
Step 4: as Fig. 2 and shown in Figure 4; the related circuit veneer of the multiplex section rearrangement of above-mentioned part of path protection be network element 1# east to network element # 2 west to the circuit veneer; therefore; the east of network element 1# to network element 2# west to STM-16 rank circuit veneer by safe dismounting; be replaced by other circuit veneer of STM-64 level; between two other veneers of STM-64 level of newly plugging, correctly connect other optical fiber of STM-64G speed level
Step 5: as Fig. 2 and shown in Figure 4; other veneer of different rates level; in MSP-ring; the corresponding protection of service aisle passage is different; during as two fibre two-way multi-section ring protections; the protection passage of passage 1 correspondence of STM-16 rank circuit veneer is a passage 9, and the protection passage of passage 1 correspondence of STM-64 rank circuit veneer is a passage 33, so other upgrading of circuit veneer speed level need be informed the APS turning protocol.
For the system of plug and play, network element 1# and network element 2# can automatically identify this speed upgrade when other veneer of STM-16 level is replaced to other veneer of STM-64 level, and network element internal is notified this information the APS turning protocol module of this network element automatically; For the Non-Plug and Play system, the difference of logical board and Physical board is arranged, logical board is the veneer that the user creates, and Physical board is to realize the veneer inserted on the groove position, when having only logical board consistent with Physical board, configuration on this veneer is just effective, so for this system, after changing Physical board, also to change logical board, the modification of logical board needs the user to operate, then the user finishes by the order that webmaster directly issues a logical board speed upgrade, concrete command parameter can comprise slot number, board type before the upgrading, board types after the upgrading etc., network element upgrade inner data after receiving order under the user automatically, this information are notified the APS turning protocol module of this network element again.
Step 6: as Fig. 2 and shown in Figure 4; to network element 1# issue the cancellation east to the Forced Switch order; or to network element 2# issue the cancellation west to the Forced Switch order; make the multiplex section ring be in idle condition; professional service aisle from the protection routing restoration to network element 1# and network element 2# transmits; switch when recovering, service outage duration is less than 50ms.
Like this, shown in the SDH ring at Fig. 2 middle part, the east of network element 1# to network element # 2 west to the circuit veneer become filled circles by the open circles on top, corresponding part of path online upgrading is the STM-64 rank.
Step 7: as Fig. 2 and shown in Figure 4, repeating step three is to the operation of step 6, speed upgrade behind all circuit single-board replacements of other part of path, promptly, the speed of each section all upgrades to the STM-64 rank, shown in the SDH ring of the bottom of Fig. 2, the speed upgrade of whole SDH ring is the STM-64 rank.
Step 8: if the SDH ring after this upgrading is not needed to carry out multiplex section protection, then delete multiplex section protection and get final product, if also need MSP-ring, then this step can be omitted.
It should be noted that, at the repeating step three of above-mentioned steps seven to the process of step 6, switch and switch recovery each time the business on the process upgrading section is taken place less than the 50ms hit, if all have about the business on first network element on the ring, then this is unavoidable.And if wherein some network element only is break-through to the business on the ring, about not needing, then can be to above-mentioned simplified control, to reduce the number of times of professional hit.For example network element 2# only carries out break-through to the business on this SDH ring, then can be simultaneously during execution in step three to the east of network element 1# to the west of network element 3# to issuing the Forced Switch order, once with between network element 1# and the network element 2#, and two adjacent network element sections upgrade to the STM-64 rank between network element 2# and the network element 3#, promptly, the part of path of the multiplex section rearrangement that is triggered protection is presented as two adjacent network element sections, in other words, this switch east that the related circuit veneer of protection comprises network element 1# to, the west of network element 2# to, the east of network element 2# to the west of network element 3# to the circuit veneer, can reduce like this and once switch and once switch recovery, make professional impaired influence littler; Equally, the be triggered part of path of multiplex section rearrangement protection also can be presented as adjacent network element section more than two.
Ring network have three types: two fine unidirectional, two fine two-way and four-fiber bidirectionals; though the above is directed to the SDH ring of two fine bi-directional type multiplex section protections; because various types of protection philosophies are similar; three kinds of dissimilar multiplex section protections are same or analogous for the operation of bandwidth online upgrading, repeat no more herein.
In linear networking,, generally all be configured to linear multiplex section protection in order to improve reliability.Linear multiplex section protection is a kind of as multiplex section protection; can be divided into two kinds of 1+1 and 1:N on the protected mode; as shown in Figure 3; in the 1+1 protection mode, each work system is all protected by the back-up system of a special use, in the 1:N protected mode; then by N the shared protection system of system; system just often, protection system also can be used to transmit extra traffic, thereby can obtain the efficient higher than the 1+1 system.Linear multiplex section also is to utilize K1, K2 byte in the MSOH to finish a series of agreement to hold the back process, finishes that APS switches.
Be that example is elaborated so that other 1+1 Linear multiplex section of STM-16 level is upgraded to other Linear multiplex section of STM-64 level below, as shown in Figure 3, network element A and network element B adopt the linear networking of other 1+1 of STM-16 level, network element A and network element B are imported by the outside by channel to channel adapter separately or to external output signal, the concrete control flow of circuit single board updating is as follows:
Step 1:, under the state that Linear multiplex section is not switched, the circuit veneer on the groove position at protection passage place is replaced to other circuit veneer of STM-64 level by other veneer of STM-16 level as Fig. 3 and shown in Figure 5.
Step 2: as Fig. 3 and shown in Figure 5, the information notification APS turning protocol of protection port line veneer speed upgrade is for the different disposal of plug and play or Non-Plug and Play system, described identical with abovementioned steps five.
Step 3: as Fig. 3 and shown in Figure 5, carry out Forced Switch, will be to the protection passage of having upgraded at the switching services on the service aisle, during Forced Switch, service outage duration is less than 50ms; Equally, can adopt Manual Switch or auto switching to trigger multiplex section switches.
Step 4:, the circuit veneer on the groove position at service aisle place is replaced to other circuit veneer of STM-64 level by other circuit veneer of STM-16 level as Fig. 3 and shown in Figure 5.
Step 5: as Fig. 3 and shown in Figure 5, the information notification APS turning protocol of service aisle circuit veneer speed upgrade is for the different disposal of plug and play or Non-Plug and Play system, described identical with abovementioned steps five.
Step 6: as Fig. 3 and shown in Figure 5, the cancellation Forced Switch, professional from protecting passage to return on the service aisle of having upgraded, when switching recovery, service outage duration is less than 50ms.
For linear networking, the concrete control flow of another kind of circuit single board updating is as follows:
Step I: as Fig. 3 and shown in Figure 6, carry out Forced Switch, will be at the switching services on the service aisle to protecting on the passage, during Forced Switch, service outage duration is less than 50ms; Equally, can adopt Manual Switch or auto switching to trigger multiplex section switches.
Step II:, the circuit veneer on the groove position at service aisle place is replaced to other circuit veneer of STM-64 level by other circuit veneer of STM-16 level as Fig. 3 and shown in Figure 6.
Step II I: as Fig. 3 and shown in Figure 6, the information notification APS turning protocol of service aisle circuit veneer speed upgrade is for the different disposal of plug and play or Non-Plug and Play system, described identical with abovementioned steps five.
Step IV: as Fig. 3 and shown in Figure 6, the cancellation Forced Switch, professional from protecting passage to return on the service aisle of having upgraded, when switching recovery, service outage duration is less than 50ms.
Step V:, the circuit veneer on the groove position at protection passage place is replaced to other circuit veneer of STM-64 level by other veneer of STM-16 level as Fig. 3 and shown in Figure 6.
Step VI: as Fig. 3 and shown in Figure 6, the information notification APS turning protocol of protection port line veneer speed upgrade is for the different disposal of plug and play or Non-Plug and Play system, described identical with abovementioned steps five.
The bandwidth of 1:N Linear multiplex section and the 1+1 Linear multiplex section bandwidth of upgrading of upgrading is similar, and behind the protection port line veneer of having upgraded, the veneer at each service aisle place of progressively upgrading then repeats no more herein.
In the online upgrading method at linear networking, service aisle is connected on the different circuit veneers with the protection passage.
The above bandwidth online upgrading method for ring network and linear networking has been described in detail, for any SDH network, no matter whether its complexity, its topological structure all can be expressed as the simple combination at ring network, linear networking or two kinds of networkings, and sonet network also can be equal to according to above explanation to replace and obtains, therefore, those skilled in the art do not need creative work, just can finish the online upgrading of any SDH/SONET network bandwidth according to the above.
Claims (15)
1. bandwidth upgrading method is applied to it is characterized in that among SDH (Synchronous Digital Hierarchy) SDH or the Synchronous Optical Network SONET:
A1, in ring network, trigger the multiplex section rearrangement protection of a part of path;
A2, the described related circuit veneer of protection of switching of replacing are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
The multiplex section rearrangement of part of path described in A3, the cancellation step A1, the passage of resuming work.
2. bandwidth upgrading method according to claim 1 is characterized in that, also comprises step after the described steps A 3:
A4, repetition above-mentioned steps A1-A3, speed upgrade behind all circuit single-board replacements of other part of path.
3. bandwidth upgrading method according to claim 1 is characterized in that: for ring network, when the multiplex section rearrangement protection took place between the network element, instantaneously changing was switched the related circuit veneer of protection.
4. bandwidth upgrading method according to claim 3 is characterized in that: described multiplex section rearrangement produces by Forced Switch.
5. bandwidth upgrading method according to claim 1 is characterized in that: after described circuit veneer was replaced, corresponding network element is the described speed upgrade of identification automatically, this information was notified the APS APS turning protocol module of this network element.
6. bandwidth upgrading method according to claim 1; it is characterized in that: after described circuit veneer is replaced; issue the order of speed upgrade by webmaster; corresponding network element is received the inner data of this order back renewal, this information is notified the APS APS turning protocol module of this network element.
7. bandwidth upgrading method according to claim 1 is characterized in that: in the described steps A 1, the described part of path that is triggered the multiplex section rearrangement protection is presented as one or more adjacent network element sections.
8. bandwidth upgrading method is applied to it is characterized in that among SDH (Synchronous Digital Hierarchy) SDH or the Synchronous Optical Network SONET:
B1, in linear networking, change protection port line veneer, after the protection circuit veneer was replaced, the message of circuit veneer speed upgrade was informed the APS turning protocol;
B2, the protection of triggering multiplex section rearrangement;
B3, replacing service aisle circuit veneer are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
B4, cancellation multiplex section rearrangement, the passage of resuming work.
9. bandwidth upgrading method according to claim 8 is characterized in that: described multiplex section rearrangement produces by Forced Switch.
10. bandwidth upgrading method according to claim 8 is characterized in that: after described circuit veneer was replaced, corresponding network element is the described speed upgrade of identification automatically, this information was notified the APS APS turning protocol module of this network element.
11. bandwidth upgrading method according to claim 8; it is characterized in that: after described circuit veneer is replaced; issue the order of speed upgrade by webmaster; corresponding network element is received the inner data of this order back renewal, this information is notified the APS APS turning protocol module of this network element.
12. a bandwidth upgrading method is applied to it is characterized in that among SDH (Synchronous Digital Hierarchy) SDH or the Synchronous Optical Network SONET:
C1, in linear networking, trigger the multiplex section rearrangement protection, after the protection circuit veneer was replaced, the message of circuit veneer speed upgrade was informed the APS turning protocol;
C2, replacing service aisle circuit veneer are with the information notification APS APS turning protocol of circuit veneer speed upgrade;
C3, cancellation multiplex section rearrangement, the passage of resuming work;
C4, replacing protection port line veneer.
13. bandwidth upgrading method according to claim 12 is characterized in that: described multiplex section rearrangement produces by Forced Switch.
14. bandwidth upgrading method according to claim 12 is characterized in that: after described circuit veneer was replaced, corresponding network element is the described speed upgrade of identification automatically, this information was notified the APS APS turning protocol module of this network element.
15. bandwidth upgrading method according to claim 12; it is characterized in that: after described circuit veneer is replaced; issue the order of speed upgrade by webmaster; corresponding network element is received the inner data of this order back renewal, this information is notified the APS APS turning protocol module of this network element.
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| CN101079676B (en) * | 2006-05-25 | 2011-01-19 | 中兴通讯股份有限公司 | An upgrade method of optical synchronization digital transmission network system |
| CN101197635B (en) * | 2007-12-14 | 2011-08-10 | 中兴通讯股份有限公司 | Method for smoothly upgrading phototiming digital transmission system equipment |
| CN101277164B (en) * | 2008-05-15 | 2012-07-11 | 中兴通讯股份有限公司 | Method for nondestructive switch of synchronous digital hierarchy service bus |
| CN103812680B (en) * | 2012-11-14 | 2017-12-19 | 中兴通讯股份有限公司 | A kind of system and method for realizing veneer switching |
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| CN1327328A (en) * | 2000-08-01 | 2001-12-19 | 华为技术有限公司 | Data communication system capable of smoothly expanding capacity |
| CN1467930A (en) * | 2002-07-08 | 2004-01-14 | 华为技术有限公司 | Optical fiber looped network system and optical add-drop multiplexing module and upgrade expanding method thereof |
| EP1389843A1 (en) * | 2002-08-05 | 2004-02-18 | Alcatel | M:N path protection |
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| EP1088437A2 (en) * | 1998-06-17 | 2001-04-04 | Nokia Corporation | Upgrading of subscriber connection |
| CN1327328A (en) * | 2000-08-01 | 2001-12-19 | 华为技术有限公司 | Data communication system capable of smoothly expanding capacity |
| CN1467930A (en) * | 2002-07-08 | 2004-01-14 | 华为技术有限公司 | Optical fiber looped network system and optical add-drop multiplexing module and upgrade expanding method thereof |
| EP1389843A1 (en) * | 2002-08-05 | 2004-02-18 | Alcatel | M:N path protection |
| CN1518234A (en) * | 2003-01-17 | 2004-08-04 | 深圳市中兴通讯股份有限公司上海第二 | Centralized control and hierarchical implementing switching control method and device |
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